Running Races in Colorado
Colorado has 355 upcoming running races scheduled for 2026. Most of the calendar falls in the warmer months: 221 of 355 races (62%) take place between May and September, with September (89 events) the busiest month. No single city dominates the calendar. Colorado Springs leads with 39 races, followed by Centennial (34), Denver (34), and Littleton (17). The remaining 65% of the calendar is spread across smaller cities.
Running races by month in Colorado
Sep (89) · Aug (88) · Oct (53) · Nov (35) · Jul (31) · Dec (21) · Feb (8) · Jan (7) · Jun (7) · Apr (6) · May (6) · Mar (4)
Notable Colorado events
- Bound for Boston Marathon & Half — Denver, August 2 — Boston-qualifier marathon and half marathon
- Pikes Peak Marathon — Manitou Springs, September 19 — mountain marathon
Showing 24 of 355
July 23 - Beginner / Advanced @ Cheyenne Mountain State Park
Running
Berthoud Gastro-Dash 10k
Berthoud, CO
Berthoud Gastro-Dash 10k
Running
Boulder Stroke & Stride
Boulder, CO
Boulder Stroke & Stride
Running
Never Summer 100km & 60km
Walden, CO
Never Summer 100km & 60km
2nd Annual Pancreatic Cancer Awareness in Honor of Diana Cantu - 5K Fun Run/Walk
Running
Run for Donuts 5K/10K/13.1 DENVER/AURORA
Centennial, CO